'use strict';
function one_add_next_multiply_three(collection){
  let arr=[];
  for(let m=0,n=m+1;m<n,n<collection.length;m++,n++)
  {
    arr.push((collection[m]+collection[n])*3);
  }
  return arr;
}
module.exports = one_add_next_multiply_three;
